// Press Shift twice to open the Search Everywhere dialog and type `show whitespaces`,
// then press Enter. You can now see whitespace characters in your code.
public class Main {
    public static void main(String[] args) {
        Repository rep1 = new Repository();
        Merchant m1 = new Merchant();
        Merchant m2 = new Merchant();
        rep1.storeGood();
        rep1.withdrawGood();
        m1.use();
        m2.use();
    }
}